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Diffstat (limited to '')
-rw-r--r-- | vendor/serde_derive/build.rs | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/vendor/serde_derive/build.rs b/vendor/serde_derive/build.rs new file mode 100644 index 000000000..2aece0469 --- /dev/null +++ b/vendor/serde_derive/build.rs @@ -0,0 +1,36 @@ +use std::env; +use std::process::Command; +use std::str; + +// The rustc-cfg strings below are *not* public API. Please let us know by +// opening a GitHub issue if your build environment requires some way to enable +// these cfgs other than by executing our build script. +fn main() { + let minor = match rustc_minor_version() { + Some(minor) => minor, + None => return, + }; + + // Underscore const names stabilized in Rust 1.37: + // https://blog.rust-lang.org/2019/08/15/Rust-1.37.0.html#using-unnamed-const-items-for-macros + if minor < 37 { + println!("cargo:rustc-cfg=no_underscore_consts"); + } + + // The ptr::addr_of! macro stabilized in Rust 1.51: + // https://blog.rust-lang.org/2021/03/25/Rust-1.51.0.html#stabilized-apis + if minor < 51 { + println!("cargo:rustc-cfg=no_ptr_addr_of"); + } +} + +fn rustc_minor_version() -> Option<u32> { + let rustc = env::var_os("RUSTC")?; + let output = Command::new(rustc).arg("--version").output().ok()?; + let version = str::from_utf8(&output.stdout).ok()?; + let mut pieces = version.split('.'); + if pieces.next() != Some("rustc 1") { + return None; + } + pieces.next()?.parse().ok() +} |